The overall relative risk (RR) for caries development in the
permanent dentition was 2.6 (Pearson chi-square test, p < 0.001),
indicating that children who had caries in their primary teeth were
nearly three times more likely to develop caries in their permanent
teeth than the children who were previously free of caries. This Fig.
shows the specific value of RR for caries development in the permanent
dentition, depending upon caries presence on different types of
primary teeth. Caries on primary maxillary (Max) incisors alone did
not have significant predictable value. Caries on mandibular (Man)
molars had the highest RR value (1.89) with the highest predictive
efficiency (65.8%).